In only his third official appearance for Barcelona's first team, on 12 January 2012, Roberto scored his second goal, helping the visitors come from behind to win it 2–1 against Osasuna in the domestic cup (6–1 on aggregate).[11] On 16 December 2014, also in that competition, he netted his third, contributing to an 8–1 demolition of Huesca at the Camp Nou.[12]

On 20 August 2016, Roberto started as a right-back and provided two assists in a 6–2 home defeat of Betis in the opening match of the campaign.[18] On 24 September, from the same position, he again contributed with two assists in a 5–0 away rout of Sporting de Gijón.[19]

In injury time of the first half of El Clásico on 6 May 2018, Roberto was shown a straight red card after punching Marcelo, in an eventual 2–2 home draw.[23] He was first-choice right-back during the season ahead of newly signed Nélson Semedo, and his team won the national championship after a one-year wait.[24]

Sergi Roberto plays predominantly as a full-back, but also excels in midfield. In the 2016–17 season, under Luis Enrique, he played in seven different positions with Barcelona. This versatility, combined with his pace, strength, rigorous work rate and accurate passing earned the praise of the manager: “In a team like ours, except in goal, he could play in any position, it’s no surprise. The most difficult thing is doing it well all over the field and Sergi Roberto does that.”[29][2] He is best utilized as a box-to-box player.[30]

In 2014, Sergi Roberto started dating Israeli model Coral Simanovich (Pnina Rosenblum's stepdaughter).[31] They became engaged in early September,[32][33] and got married in Tel Aviv on 30 May 2018.[34]